EP3750346A1 - Methods and network devices for mobility management of unmanned aerial vehicles - Google Patents
Methods and network devices for mobility management of unmanned aerial vehiclesInfo
- Publication number
- EP3750346A1 EP3750346A1 EP18904166.8A EP18904166A EP3750346A1 EP 3750346 A1 EP3750346 A1 EP 3750346A1 EP 18904166 A EP18904166 A EP 18904166A EP 3750346 A1 EP3750346 A1 EP 3750346A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wireless communication
- communication device
- discovery signal
- radio network
- network node
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 238000004891 communication Methods 0.000 claims abstract description 305
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/00835—Determination of neighbour cell lists
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
- H04W36/324—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by mobility data, e.g. speed data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
Definitions
- the present disclosure relates to the area of mobility management in wireless communication systems, and in particular to methods for managing mobility of unmanned vehicles based on discovery signals transmitted by the unmanned vehicles.
- the disclosure also relates to a corresponding wireless communication device and network nodes and to a computer program for implementing the proposed method.
- the 3rd Generation Partnership Project, 3GPP is responsible for the
- LTE Universal Mobile Telecommunication System
- UMTS Universal Mobile Telecommunication System
- LTE Long Term Evolution
- the 3GPP work on LTE is also referred to as Evolved Universal Terrestrial Access Network, E- UTRAN.
- LTE is a technology for realizing high-speed packet-based communication that can reach high data rates both in the downlink and in the uplink and is thought of as a next generation mobile communication system relative to UMTS.
- LTE allows for a system bandwidth of 20 MHz, or up to 100 MHz when carrier aggregation is employed.
- LTE is also able to operate in different frequency bands and can operate in at least Frequency Division Duplex, FDD, and Time Division Duplex, TDD, modes.
- 3GPP is also responsible for standardization of the New Radio (NR), also referred to as a 5G radio technology.
- NR New Radio
- the system bandwidth is flexible and similar to LTE it can operate in both FDD and TDD.
- a User Equipment, UE, or a wireless communication device is wirelessly connected to a Radio Base Station, RBS, commonly referred to as a NodeB, in UMTS, and as an evolved NodeB, eNodeB or eNB, in LTE.
- RBS Radio Base Station
- eNodeB evolved NodeB
- eNB evolved NodeB
- LTE Long Term Evolution
- a base station may also be referred to as gNB.
- a Radio Base Station, RBS, or an access point, or a transmission and reception point (TRP) is a general term for a radio network node capable of transmitting radio signals to a wireless
- Unmanned Aerial Vehicle or drones for professional or leisure applications are used for several missions. During their missions, they might be connected to a remote user or a Mission Application Server to report regularly or by burst mission information that are processed to generate added value products. The Mission information that is reported is often images of the environment that is being flown over. Thus, cellular connectivity will be key for coordinated operation and control of UAVs, more commonly referred to as drones, enabling a growing set of use cases within and beyond the operator's visual line of sight.
- These aerial vehicles are herein considered to be aerial wireless communication devices or aerial UEs. With this said, it is of course desirable to let aerial vehicles being served by existing network deployments, e.g. LTE or NR, with Base Station antennas targeting terrestrial coverage.
- LTE and NR uses downlink reference signals transmitted by the eNBs or gNBs.
- a user equipment, UE receiving the reference signal can measure the quality of neighbour cells for mobility management purposes.
- One challenge for aerial UE ' s related to mobility management mainly depends on the increased height above ground, since the higher height typically increases the number of detected neighbour cells significantly. Since once aerial (i.e. flying or air born) the UE would mainly have Line of Sight, LOS, to the eNodeB(s), which provides good signal conditions (minimum amount of reflections or obstacles blocking the connection) for the radio network nodes, see Fig. 1. Fig.
- FIG. 1 illustrates a wireless communication network where two air borne UEs 10, here individually denoted 10a and1 Ob, have LOS to more cells than the terrestrial UE 10c. As can be seen in Fig. 1 the number of cells increases with height H1 , H2.
- the aerial UEs are also subject to a more significant interference from the neighbouring cells when operating on higher altitudes, which in turn may affect the measurement time per cell and therefore impacts the mobility robustness.
- detectable cells depend on the aerial UE ' s
- the Base station may configure the aerial UE with an appropriate list of“frequencies” to measure on.
- An object of embodiments herein is to improve handover efficiency in the network, and to introduce an identification method for UEs such as e.g. aerial wireless communication devices by introducing mobility measurements based on discovery signals.
- a method for use in a wireless communication device, for supporting mobility management of the wireless communication device in a wireless communication network comprising a plurality of radio network nodes, wherein one of the plurality of radio network nodes is a serving radio network node of the wireless communication device.
- the method comprises determining whether to transmit a discovery signal configured for use by one or more of the radio network nodes in the wireless communication network for mobility management of the wireless communication device; and upon the determining being positive, transmitting the discovery signal, wherein the discovery signal comprises an identifier of the wireless communication device and an indication that the discovery signal is for use in mobility management.
- discovery signals, or announcement signals for mobility management purposes will lead to improved mobility management suitable for aerial wireless communication devices. It will also make it possible for the wireless
- the discovery signal further comprises an identifier of the radio network node serving the wireless communication device.
- a neighbouring radio network node may identify the signal and report it to the corresponding serving radio network node without any previous request from the serving radio network node
- the discovery signal is transmitted on radio resources that are also used for transmission of signals for use by functions other than mobility management.
- the proposed solution does not require that dedicated resources are allocated (e.g. once the UE becomes airborne), but may reuse already allocated uplink resources such as the resource pool allocated for sidelink discovery signalling.
- the discovery signal is transmitted on radio resources that are also used by the wireless communication device for
- the determining comprises evaluating one or more criteria taking a mobility status such as an aerial status of the wireless communication device as input.
- the mobility status may trigger the transmission of the discovery signal
- the method comprises monitoring radio resources for discovery signals and upon identifying, a discovery signal comprising an indication that the discovery signal is for use in mobility management, reporting mobility data associated with the discovery signal to one or more of the other radio network nodes
- a discovery signal comprising an indication that the discovery signal is for use in mobility management no dedicated resources are needed.
- the mere presence of the discovery signal may trigger receiving radio network nodes to take appropriate actions.
- the mobility data comprises identity data defining wireless communication devices identified by the detected discovery signals.
- the node implementing the mobility function may be informed about which radio network nodes are candidate targets for a handover.
- the mobility data comprises measurement data corresponding to the detected discovery signals.
- the discovery signals may then replace traditional reference signals for the purpose of estimating e.g. channel properties and/or signal strength.
- the mobility data comprises measurement data corresponding to the detected discovery signals that fulfil a predefined criteria.
- the criteria may be related to meeting a threshold value of one measurement data parameter, or a combination of threshold values for multiple measurement data parameters.
- the mobility data comprises information identifying a wireless communication device that transmitted the discovery signal and/or a serving network node of the wireless communication device.
- the radio network node may be based on only data included in the discovery signal, identify the serving network node and report relevant measurements concerning a discovered wireless communication device. No prior signalling is required.
- the method comprises sending, to the serving radio network node a request asking the serving radio network node whether to report mobility data associated with the wireless communication device and receiving, from the serving radio network node, a response acknowledging the request. This additional signalling lets the serving network node control which mobility data to receive.
- the wireless communication network comprises a plurality of other radio network nodes. Then the method further comprises sending, to one or more of the radio network nodes a request asking them whether to report mobility data associated with the wireless communication device.
- the discovery data may be made available to all radio network nodes in the wireless communication network.
- a method for use in a serving radio network node of a wireless communication device in a wireless communication network wherein the wireless communication network comprises a plurality of radio network nodes, for managing mobility of the wireless
- the method comprises receiving, from one or more of the network nodes, mobility data associated with measurements performed on a discovery signal transmitted by the wireless communication device; and performing mobility management of the wireless communication device based on the received mobility data.
- performing the mobility management comprises selecting a target network node from the one or more radio network nodes based on the received mobility data; and handing over the wireless communication device from the serving radio network node to the selected target radio network
- the method further comprises determining a mobility status such as for example an aerial status or a high velocity status of the wireless communication device and sending, based on the mobility status, a message to the wireless communication device comprising information associated with the transmission of the discovery signal.
- a mobility status such as for example an aerial status or a high velocity status of the wireless communication device
- the information comprises an instruction to the wireless communication device to transmit the discovery signal.
- the information comprises one or more criteria to be used by the wireless communication device when determining whether to transmit the discovery signal.
- the information comprises information defining a repetition period and/or radio resource information to use when transmitting the discovery signal.
- the method further comprises determining aerial mobility status of the wireless communication device and sending, based on the mobility status, to one or more of the radio network nodes, a message comprising information associated with measurements to be performed by the radio network node on a discovery signal.
- a wireless communication device configured to operate in a wireless communication network being configured to perform all aspects of the method for use in a wireless communication device described herein.
- a radio network configured to support mobility management and to perform all aspects of the method for use in a target radio network node described herein.
- a serving network node configured to perform all aspects of the method for use in a serving network node described herein.
- a computer program comprising instructions which, when the program is executed, cause the wireless communication device or network node to carry out the method as described herein.
- Fig. 1 illustrates a wireless communication network where an aerial UE observes more neighbour cells than a terrestrial UE.
- Fig. 2 illustrates a parts of a wireless communication network.
- Fig. 3 is a signalling diagram associated with mobility management according to various example embodiments.
- Fig. 4 illustrates the proposed method for use in a wireless communication device.
- Fig. 5 illustrates the proposed method for use in a network node.
- Fig. 6 illustrates the proposed method for use in a serving network node.
- Fig. 7 illustrates an example wireless communication device.
- Fig. 8 illustrates an example network node.
- Fig. 9 illustrates an example serving network node.
- radio communication systems such as LIE
- the radio interface is optimized to support low-to-medium mobility scenarios, it can also support very high-speed users.
- a UE may be in idle or connected mode, with respect to the network.
- An idle UE has no dedicated signalling or data bearers associated with it. In other words, no network/radio resources are specifically allocated to it.
- An idle UE’s location is known to the network only within a contiguous groups of cells, called tracking area. While an idle UE is not attached to any eNodeB, it is required to select a suitable cell and camp on it. The procedure of an idle UE selecting and camping on a cell is known as Cell Selection. An idle UE, while camping on a cell, continues to regularly monitor the signal quality of the camped cell. In case a quality level criteria is met, (e.g.
- the UE may monitor other cells and may decide to camp on another cell if radio conditions indicates a benefit to do so, for example, due to UE mobility. This process is known as Cell Reselection.
- the criteria to be adopted by an idle UE for selecting/reselecting a cell are communicated to the UE via the system
- a UE While in connected state, a UE may need to switch to another eNodeB because of the degradation in the received signal power from the serving eNodeB, which may happen due to user mobility.
- the process of a connected mode UE changing its association from one eNodeB (source/serving radio network node) to another (target radio network node) is referred to as Handover (HO).
- Handover In LTE, the HO process is controlled by the eNodeB.
- Mobility management refers to determining an appropriate cell for camping and an appropriate eNodeB for association, for an idle and connected mode UE, respectively, performing the required signalling exchange, and ensuring minimal delay while avoiding unnecessary cell changes.
- Embodiments herein describe solutions to the above mentioned problems related to mobility management for aerial UEs by introducing a trigger based uplink mobility measurement solution, which is based on a discovery signal transmitted by UEs, in particular by aerial UEs.
- a discovery signal herein refers to an unscheduled discovery announcement message.
- the discovery signal is typically an unscheduled signal transmitted on radio resources that are also used by other wireless communication devices and possibly also for different types of discovery or sidelink transmissions/signals.
- a resource pool to use for transmission of discovery signals is typically allocated by the network.
- the discovery signal comprises information that enables the receiver to detect its purpose and basic information as e.g the identity of the sender.
- the discovery signal for use in mobility management may also comprise other mobility related information.
- the network needs to configure some sort of uplink discovery signal that the aerial UE would transmit with certain configuration, and also configure neighbour radio network nodes to listen to.
- Embodiments herein may be implemented in one or more wireless communication networks.
- Fig. 2 depicts parts of such a wireless communications network 1 , e.g. the network of Fig. 1.
- the wireless communications network 1 is for example a 5G, LTE, UMTS, GSM, any 3GPP wireless communications network, or any cellular wireless communications network or system.
- the wireless communications network 1 comprises a plurality of radio network nodes 20, 30, 40. For simplicity only three radio network nodes are illustrated in Fig. 2. However, it must be appreciated that in reality the number of radio network nodes is typically much higher. Each radio network node serves a corresponding cell 0, a3, a4.
- radio network node may correspond to any type of radio network node.
- the radio network nodes 20, 30, 40 may be a base station, such as a gNB or eNB.
- the base station may also be referred to as a NodeB, an evolved Node B (eNB, eNode B), a base transceiver station (BTS), Access Point (AP)
- eNB evolved Node B
- BTS base transceiver station
- AP Access Point
- Wi-Fi AP Wireless Fidelity
- base station router or any other network unit capable of communicating with a wireless communications device within a cell served by the base station depending e.g. on the radio access technology and terminology used.
- the radio network nodes 20, 30, 40 are connected to the core network of the wireless communication via the backhaul.
- the network nodes 20, 30, 40 may communicate with a wireless communications device 10, in LTE referred to as a UE.
- the wireless communications device 10 is here an unmanned aerial vehicle, UAV.
- the methods may also be used for e.g a mobile terminal or a wireless terminal, a mobile phone, a computer such as e.g. a laptop, a Personal Digital Assistants (PDAs) or a tablet computer, with wireless capability, target device, device to device UE, MTC UE or UE capable of machine to machine
- LIE Equipment
- LME Laptop Mounted Equipment
- USB dongles etc. or any other radio network units capable to communicate over a radio link in a wireless communications network.
- One of the plurality of radio network nodes 20, 30, 40 is a serving radio network node 20 of the wireless communication device 10.
- LIE the wireless local area network
- the communications device 10 is continuously performing measurements on neighbour network nodes in order to identify potential target radio network nodes 30, 40 that the wireless communications device 10 can be handed over to.
- the proposed technique will be illustrated in more detail by a number of exemplary embodiments. The following embodiments will be described referring to the example wireless communication network 1 of Fig. 2. However, it must be appreciated that the methods may be implemented in other networks as well.
- the disclosure is based on the idea to in addition to, or in some cases possibly instead of the legacy downlink based UE measurements, the network performs additional measurements related to UE mobility. Measurements on uplink reference signals have already been discussed in connection with New Radio,
- V2x of LTE Release 14 allows vehicles to send basic safety messages which basically means“Here am I” and in some cases includes information such as location, heading, and speed.
- a V2X message is a D2D message, sent in the uplink frequency band and in D2D case denoted as a sidelink communication using one-to-many communication procedures described in 3GPP TS 23.303 v15.0.0 and TS 36.331.
- the V2X message is a transmission in the uplink frequency band, this message could also be received by the eNodeB(s) to identify the UE and estimate the uplink radio channel (similar to the functionality achieved for serving cell by the use of uplink Sounding
- the eNodeB (s) might even use the signal to estimate the location of the aerial UEs using Uplink-Time Difference of Arrival, UTDOA. This would possibly also allow the network to detect whether the UE is air born at high altitude or not, as once air born the UE would mainly have Line of Sight, LOS, to the eNodeB(s), providing good signal conditions (minimum amount of reflections) for the radio network nodes.
- UTDOA Uplink-Time Difference of Arrival
- V2V/discovery messages in LTE it is herein proposed that radio network nodes could use this type of transmissions for mobility measurements.
- V2X communication (as described in TS 23.285) uses vehicle messages (defined by the Society of Automotive Engineers, SAE, Dedicated Short Range Communications, DSRC, (J2735-20092) Message Set Dictionary) transmitted on sidelink user plane resources and one-to many communication as described in TS 23.303.
- the discovery signals e.g. the discovery 1 announcement message, for the purpose of determining appropriate target radio network nodes (e.g. handover candidates) of a wireless communication device.
- the radio network nodes detecting the discovery signals could be able to send mobility information e.g.
- a message with same or similar format as the discovery message could also be sent as a V2V message using the sidelink user plane resources. For simplicity, we also refer to this message as a discovery signal.
- Embodiments will firstly be described by describing the interactions of the wireless communications device 10 with the serving network node 20 and a network node 30 of Fig. 2 with reference to a combined signalling diagram and flow chart illustrated in Fig. 3. Note that the same process would typically be performed by radio network node 40 (which is indicated by the dashed target network node 40). Then the method steps performed by the wireless communications device 10, the serving network node 20 and target network node 30 will be described separately in more detail with reference to Fig. 4-6.
- Fig. 3-6 comprise some operations which are illustrated with a solid border and some operations which are illustrated with a dashed border.
- the operations which are comprised in a solid border are operations which are comprised in the broader example embodiment.
- the operations which are comprised in a dashed border are example embodiments which may be comprised in, or a part of, or are further operations which may be taken in addition to the operations of the solid border example embodiments. It should be appreciated that the operations need not be performed in order.
- the proposed technique will now be described referring to the operations performed in the wireless communication device 10, the serving radio network node 20 and radio network node 30, which is a candidate target radio network node for the wireless communication device 10 in an upcoming handover. These operations are typically performed during normal operation (in connected mode), when the wireless communication device 10 is moving in the network.
- the use of the proposed discovery signals to be transmitted by wireless communication devices for improved mobility management is typically controlled by the mobility function of the wireless communication network 1.
- the mobility function is for example implemented in the serving radio network node 20, but it may as well be distributed to other radio network nodes. Either explicit activation by network signalling can be considered (e.g. RRC control), but also an activation of the discovery signal and uplink based measurements based on predefined trigger parameters in the wireless communication device 10 is possible.
- the activation of the discovery signal may be based on various parameters, such as certain channel conditions.
- Example of such conditions could be that the wireless communication device 10 is reporting a high number of detected neighbouring cells, or that the interference level is higher than a certain threshold.
- the serving radio network node 20 determines S10 a mobility status of the wireless communication device 10. For example, in the case of determining an aerial status, the serving radio network node 20 determines if the wireless communication device 10 is flying or not. This determination is e.g. made based on information received from the wireless communication device 10.
- the decision whether to transmit the discovery signal or not is e.g. based on a mobility status, such as the aerial status of the wireless communication device.
- the decision is made in the network and an explicit instruction is signalled to the wireless communication device 10.
- the wireless communication network 1 may also or in addition provide information to the wireless communication device 10 for use when determining whether to transmit the discovery signal.
- the serving radio network node 20 sends S1 1 , based on the determined mobility status or other network parameters, a message to the wireless communication device 10 comprising information associated with the transmission of the discovery signal.
- the wireless communication device 10 receives SO the message comprising information associated with the transmission of the discovery signal.
- the information will be used by the wireless communication device 10 to determine whether to transmit the discovery signal.
- the wireless communication device 10 will normally do as instructed by the network.
- the wireless communication device 10 typically makes the final decision regarding whether to transmit the discovery signal or not.
- the wireless communication device 10 determines S1 whether to transmit the discovery signal configured for use by one or more of the radio network nodes 30, 40 in the wireless communication network for mobility management of the wireless communication device. If the wireless communication device 10 has received information associated with the transmission of the discovery signal, this information is in general used in the determining S1.
- the information associated with the transmission of the discovery signal may either be an explicit instruction to activate the discovery signal for use in mobility
- the information may comprise one or more criteria (i.e. rules) or other input that the wireless communication device may use to determine whether to activate the discovery signal or not. This will be described in further detail in connection with Fig. 4 and Fig. 6.
- wireless communication device 10 may in addition ask the wireless communication device for permission to transmit the discovery signal This might be relevant if the trigger for transmitting the discovery signal is a default trigger that is activated when predetermined criteria is fulfilled in the wireless communication device 10, e.g that the aerial UE is flying. Then the wireless communication device 10 sends S2, to its serving radio network node 20, a request for permission to transmit the discovery signal and receives S3 an acknowledgement of the request. The wireless communication device 10 would then typically only proceed to the next step and transmit the discovery signal if allowed. Alternatively the permission/authorisation to send the discovery signal can be handled on NAS (Non-Access Stratum) level when the wireless
- the communication device 10 register to the network or re-register due to mobility or periodic timer expiry by sending a Tracking Area Update, TAU
- the eNB can be updated with the by the MME when the eNB is setting up the UE context in the eNB
- step S1 If the determining of step S1 is positive i.e. if it is determined that a discovery signal shall be transmitted, then the wireless communication device 10 transmits S4, the discovery signal.
- the discovery signal 100 is illustrated by the thick arrows in Fig. 2.
- the transmitting S4 may, as will be explained in further detail in connection with Fig. 4 comprise one single transmission or several repetitions.
- the discovery signal is transmitted on radio resources that are also used for transmission of signals for use by other functions than mobility management.
- the monitored radio resources are also used for transmission of Device-to-Device, D2D, discovery signals or user plane
- the discovery signal needs to be configured such that it can be identified by a receiving device. Consequently, the discovery signal comprises an identifier of the wireless communication device 10 and an indication that the discovery signal is for use in mobility management.
- the indication is for example an information element e.g. in the announcer info field, a flag comprised in the discovery signal e.g use spare bits or a pre-defined format of the discovery signal e.g. new message type.
- the indication enables a receiving device to know that the discovery signal shall be used for mobility management.
- the purpose of the discovery signal is to facilitate Mobility Management, MM, of the wireless communication device 10.
- the discovery signal is typically received by multiple candidate target radio network nodes 30, 40 of the wireless
- Fig. 2 only illustrates the signalling between the wireless communication device 10, the serving eNB 20 and one other network node 30, which is a candidate target for an upcoming handover.
- the same or corresponding signalling would typically also take place with regard to network node 40.
- it may be received by any of the radio network nodes 20, 30, 40 of the wireless communication network 1 when channel conditions allows it.
- the radio network node 30 may previously have been informed that discovery signal by the serving network node 20.
- the serving network node 20 sends S12, to one or more radio network nodes 30, a message comprising information associated with a discovery signal for use in mobility management and consequently the radio network node 30 receives S20 the message comprising information associated with discovery signal transmitted by the wireless communication device 10.
- the one or more radio network nodes are typically neighbours of the serving network node, which are candidate targets for a future handover.
- the information e.g. comprises information needed to monitor and detect the discovery signal or information regarding what kind of report the serving network node 20 wants.
- the radio network nodes 30 monitors S22 radio resources for the discovery signals.
- target radio network node 30 does not get any previous indication of information about the discovery signal.
- the target radio network node 30 needs to know, which radio resources to monitor for this type of signals. However, this information may be fix or configured at system setup.
- the monitored radio resources may also be used for transmission of signals for use by other functions than mobility management, such as for transmission of Device-to-Device, D2D, discovery signals or user plane communication in some embodiments the monitoring S22 also comprises monitoring the determined radio resources for other signals.
- the radio network node 30 may also have been informed beforehand that discovery signals for use in mobility management are transmitted in the wireless communication network 1 and which resources will be used for such
- the radio network node 30 determines S21 which radio resources are used by wireless communication devices 10 when transmitting discovery signals for use in mobility management and then the monitoring S22 comprises monitoring S22 the determined radio resources.
- the determining e.g. comprises reading the information received S20 from the network or obtaining information stored in the radio network node 30.
- a receiving radio network node When a receiving radio network node detects data (typically a signal level above a certain threshold) on the radio sources used for discovery signals, it interprets the signal to determine what type of signal it is. As explained above, the discovery signal is configured to be received by one or more of the plurality of network nodes of the wireless communication network 1.
- data typically a signal level above a certain threshold
- the radio network node 30 When the radio network node 30 identifies S23 a discovery signal for use in mobility management, it informs the wireless communication network 1
- the radio network node 30 upon identifying S23, a discovery signal comprising an indication that the discovery signal is for use in mobility management, reports S26 mobility data associated with the discovery signal to one or more of the other radio network nodes 20 in the communication network 1. For example it reports the reception to the serving radio network node 20.
- the identity of the serving radio network node 20 of the wireless communication device 10 is e.g. obtained from information comprised in the discovery signal as will be further described in connection with Fig. 4. Alternatively enabling identification of the serving radio network node 20 may also have been
- the mobility data comprises e.g. identity data defining wireless communication devices identified by the detected discovery signals or measurement data corresponding to the detected discovery signals that fulfil a predefined criteria
- the radio network node 30 may ask the serving network node 20 if it wants to receive a report associated with the detected discovery signal.
- the radio network node 30 sends S24, to the serving radio network node 20, a request asking the serving radio network node 20 whether to report mobility data associated with the wireless communication device 10.
- the radio network node 20 receives S13 the message and sends S14 a response acknowledging the request to the radio network node 30.
- the radio network node 30 receives S25 the response from the serving radio network node 30 and reports mobility data accordingly.
- the radio network node 3G is pre-configured with rules when to report in message S16 sent by radio network node 20.
- the serving radio network node may send a request to one or more of its neighbours requesting them to report mobility data associated with a discovery signal transmitted by the wireless communication device 10. In response it will then receive, from the neighbouring radio network nodes, a response acknowledging the request. This additional signalling lets the serving network node control which mobility data to receive.
- the serving network node 20 receives S15 the mobility data, sent S26 from one or more of the other network nodes in the wireless communication network 10.
- the mobility data may, as discussed above, be sent S26 repeatedly or when certain criteria are fulfilled.
- the mobility data may typically be used in the serving network node when performing S16 mobility management e.g. for handover decisions and/or selecting target radio network node etc.
- the mobility function in the serving network node 20 uses the mobility data to compare channel conditions between the wireless communication device 10 and the radio network nodes in the wireless communication network 1 In this comparison the serving network node may compare measurements performed on the discovery signal by other radio network nodes with its own measurements.
- FIG. 4 illustrates a flow chart with method steps performed by wireless
- the steps of the method may be defined in a computer program, comprising instructions which, when the program is executed by one or more processors causes the wireless communication device 10 to carry out the method.
- the steps of the method may also be defined in a computer-readable medium.
- the computer-readable medium comprises instructions that, when executed by a one or more processors, causes the wireless communication device 10 to carry out the method.
- the method comprises determining S1 whether to transmit a discovery signal configured for use by one or more of the radio network nodes in the wireless communication network for mobility management of the wireless communication device.
- the determining S1 comprises evaluating one or more criteria.
- a criteria is a pre-determined rules taking one or more parameters as input.
- One example of a criteria for activation of the discovery signal could be a default activation as soon as the wireless communication device 10 enters“Aerial mode”, or if the wireless communication device 10 height or speed is above a predefined or signalled threshold, or if other movement pattern of the wireless communication device 10 is discovered.
- parameters that the criteria could take as input are, a speed of the wireless communication device 10 and an aerial status of the wireless communication device 10.
- the activation could be done by default in case of the number of active cell changes (handovers) performed over a given period of time is higher than a predefined value.
- the periodicity may be lower as compared to at a trigger based transmission.
- Another example of a condition that might trigger the activation of the discovery signal could be that the wireless communication device 10 is reporting a high number of detected neighbour cells, or that the interference level is higher than a certain threshold.
- examples of parameters that the criteria could take as input are the number of candidate target radio network nodes 30, 40.
- the one or more criteria takes a mobility status of the wireless communication device as input.
- the wireless communication device 10 may for example always transmit the discovery signal when in an aerial mode.
- the one or more criteria may also take other parameters as input, e.g. the number of radio network nodes being candidate target radio network nodes of the wireless communication device 10 or the speed of the wireless communication device.
- the determining may also be based on signalling e.g. received from the serving network node 20 of the wireless communication device 10.
- the method further comprises receiving SO, from the serving radio network node 20 of the wireless communication device 10, a message comprising information associated with the transmission of the discovery signal and then the determining S1 is based on at least a part of the received information.
- the signalled information may be an explicit instruction to the wireless
- the signalled information is one or more criteria to be used by the wireless communication device when determining whether to transmit the discovery signal or parameters to be used when determining S1 whether to transmit the discovery signal.
- the discovery signal can be configured to be transmitted once, e.g. upon receiving the activation request by the network. It may also be configured to be transmitted periodically, with either a predefined (e.g. in standard or at network setup) or network configured periodicity.
- the received information associated with the transmission of the discovery signal defines a repetition period and/or radio resources to use when transmitting the discovery signal.
- the determining S1 is based on at least a part of the received information.
- the determining is negative (i.e. the discovery signal is not (“NO”) for use in mobility management) then no action is taken by the mobility function, i.e. the function implementing mobility management in the wireless communication network 1. Of course actions my then be taken by other functions or nodes in the wireless communication network 1.
- the method comprises transmitting S4 the discovery signal.
- the transmitted discovery signal comprises an identifier of the wireless communication device 10 and an indication that the discovery signal is for use in mobility management.
- the indication is for example an information element e.g. in the announcer info field, a flag e.g. use spare bits comprised in the discovery signal, and a pre-defined format e.g. new message type of the discovery signal. This could for example be implemented as an additional signalling bit in the discovery signal, which can be set to 1 or 0 acting as the indicator flag.
- the communication device 10 announces its presence and enables receiving network nodes to estimate channel conditions to the wireless communication device 10.
- the discovery signal is typically transmitted on radio resources that are also used for transmission of signals for use by functions other than mobility management, such as on radio resources that are also is used by the wireless communication device 10 for transmission of device to device, D2D, discovery signals or user plane communication.
- the new discovery signal may typically include information about the serving cell, since the radio network node in the serving cell would typically be the aggregation point for future handover decisions. Additionally, some sort of Identity of the aerial UE would be needed.
- the network could provide information about the cell and UE ID to use, since that could typically be a temporary ID to be used.
- the signal could also be updated to contain information related to UEs mobility, e.g. aerial or not, the estimated height above ground, or an estimated speed of the UE.
- the discovery signal further comprises an identifier of the serving radio network node 20 of the wireless communication device 10 and/or other mobility related information.
- the method further comprises sending S2, to its serving radio network node 20, a request for permission to transmit the discovery signal and receiving S3 an acknowledgement of the request.
- a request may e.g. be automatically sent when the wireless communication device 10 enters an aerial mode.
- Fig. 5 illustrates a flow chart with method steps performed by radio network node 30 in a wireless communication network 1 comprising a plurality of network nodes 20, 30, 40 for supporting mobility management.
- the definition of the radio network nodes herein refers to the functions performed in relation to one particular wireless communication device 10.
- one physical radio network node would typically be serving radio network node 20 for one wireless communication device 10 and candidate radio network node 30, 40 for another wireless communication device.
- the role of one particular radio network node will also change over time as the wireless communication devices move in the network.
- a radio network node would typically perform both the method of Fig. 5 and Fig. 6 in parallel, but for different wireless communication devices.
- the steps of the method may be defined in a computer program, comprising instructions which, when the program is executed by one or more processors causes the radio network node 30 to carry out the method.
- the steps of the method may also be defined in a computer-readable medium.
- the computer- readable medium comprises instructions that, when executed by a one or more processors, causes the radio network node 30 to carry out the method.
- a discovery signal is an announcement message that is used to inform receiving nodes about the presence of the wireless communication device 10.
- the method in a radio network node 30 comprises monitoring S22 radio resources for discovery signals.
- the monitored radio resources are also used for transmission of signals for use by other functions than mobility management, e.g. they are also used for transmission of Device-to-Device, D2D, discovery signals or user plane communication.
- the monitoring S22 also comprises monitoring the determined radio resources for other signals.
- the radio network node 30 will be informed in advance about discovery signals that it might receive. In other words, in some embodiments, in some
- the method further comprises receiving S20 a message comprising information associated with a discovery signal transmitted by the wireless communication device 10.
- the information is e.g. or instruction to monitor a certain radio resource or rules for measurements to be performed on discovered discovery signals. Then the monitoring S22 is performed based on at least a part of the received information S20.
- the method comprises determining S21 resources that are used for transmission of discovery signals for use in mobility management and monitoring the determined resources.
- the determining may comprise reading S21 a a predefined discovery signal configuration, which is e.g. configured at network setup or defined in network specifications.
- the determining S21 comprises receiving S21 b information defining the radio resources from a serving radio network node 20 of the wireless communication device 10, as discussed in connection with Fig. 3.
- the method further comprises, upon identifying S23, a discovery signal comprising an indication that the discovery signal is for use in mobility
- the identifying S23 typically comprises reading or interpreting the indication comprised in the discovery signal.
- the indication is e.g. an information element, a flag comprised in the discovery signal, and a pre-defined format if the discovery signal, see above.
- the discovery signal may further comprise an identifier of a serving radio network node 20 of the wireless communication device 10.
- the identifying S23 also comprises identifying a wireless
- the mobility data comprises e.g. identity data defining wireless communication devices identified by the detected discovery signals or measurement data corresponding to the detected discovery signals that fulfil a predefined criteria.
- the radio network node 30 may perform measurements on the discovery signal and report the measurements.
- the measurements may be simple signal strength measurements.
- the report may comprise information that require analysis and/or decoding of the signal.
- the radio network node 30 may use the discovery signal to estimate RSSI and then only report the reception of the discovery signal if signal strength is considered acceptable.
- the mobility data comprises measurement data
- the method further comprises sending S24, to the serving radio network node 20 a request asking the serving radio network node 20 whether to report mobility data associated with the wireless communication device 10 and receiving S25, from the serving radio network node 30, a response acknowledging the request.
- the radio network nodes 30, 40 are configured with rules when to report in message S20.
- the radio network node 30 may also ask some or all its neighbour radio network nodes (or similar) whether they are interested in receiving the report. In other words, in some embodiments the radio network node 30 sends the request to one or more of the radio network nodes in the wireless communication network 1.
- FIG. 6 illustrates a flow chart with method steps performed by a serving radio network node 20 of a wireless communication device 10 in a wireless communication network 1 , wherein the wireless communication network 1 comprises a plurality of radio network nodes 20, 30, 40.
- the steps of the method may be defined in a computer program, comprising instructions which, when the program is executed by one or more processors causes the serving radio network node 20 to carry out the method.
- the steps of the method may also be defined in a computer-readable medium.
- the computer- readable medium comprises instructions that, when executed by a one or more processors, causes the serving radio network node 20 to carry out the method.
- the method comprises receiving S15, from one or more of the network nodes 30, 40, mobility data associated with measurements performed on a discovery signal transmitted by the wireless communication device 10.
- the activation of the discovery signal is in some embodiments an explicit activation by network signalling (e.g. RRC control).
- the serving radio network node 20 triggers this transmission upon receiving an event report from the wireless communication device 10 in the Radio Resource Management, RRM, control.
- the information associated with the transmission of the discovery signal may comprise an instruction to the wireless communication device to transmit the discovery signal.
- the transmission of the discovery signal is e.g. activated based on mobility status or certain radio channel conditions detected by the serving radio network node 20.
- the transmission of the discovery signal may alternatively be triggered based on predefined trigger conditions, e.g. based on parameters relating to the wireless communication device 10.
- the information comprises one or more criteria to be used by the wireless communication device 10 when determining whether to transmit the discovery signal.
- the discovery signal can be configured to be transmitted once, e.g. upon receiving the activation request by the network. It may also be configured to be transmitted periodically, with either a predefined or network configured periodicity. In some embodiments the information associated with the transmission of the discovery signal defines a repetition period and/or radio resources to use when transmitting the discovery signal.
- the serving network node 20 performs S16 mobility
- the mobility management comprises selecting a target radio network 30 node from one or more network nodes based on the received mobility data. In some embodiments the mobility management comprises handing over the wireless communication device 10 from the serving radio network node 20 to the selected target radio network node 30.
- the mobility management comprises configuring (downlink) mobility measurements to be performed by the wireless communication device 10 based on the received mobility data.
- the disclosure also relates to a wireless communication device 10 configured to implement the method for use in a communications device 10 (Fig. 4).
- the wireless communications device 10 may comprise the modules depicted in Fig. 7 for accessing the wireless communication network 1. Those skilled in the art will appreciate that the different modules described below may also be referred to as e.g. units or the like.
- the wireless communications device 10 may comprise a transmitter 1 1 a and a receiver 1 1 b for wireless signals.
- the wireless communications device 10 is configured to, e.g. by means of a first receiving module 120, receive, from the serving radio network node 20 of the wireless communication device 10, a message comprising information associated with the transmission of the discovery signal.
- the first receiving module 120 may be implemented by a processor 12 and/or the receiver 1 1 b of the wireless communications device 10.
- the wireless communications device 10 is further configured to, e.g by means of a determining module 121 , determine whether to transmit a discovery signal configured for use by one or more of the radio network nodes 20, 30, 40 in the wireless communication network 1 for mobility management of the wireless communication device.
- the determining module 121 may be implemented by the processor 12 of the wireless communications device 10.
- the wireless communications device 10 may further be configured to, e.g. by means of a sending module 122, send, to its serving radio network node 20, a request for permission to transmit the discovery signal.
- the sending module 122 may be implemented by the processor 12 and/or the transmitter 1 1 a of the wireless communications device 10.
- the wireless communications device 10 may further be configured to, e.g. by means of a second receiving module 123, receive, receives an acknowledgement of the request for permission to transmit the discovery signal.
- the second receiving module 123 may be implemented by the processor 12 and/or the receiver 1 1 b of the wireless communications device 10.
- the wireless communications device 10 is further configured to, e.g. by means of a transmitting module 124, transmit the discovery signal, wherein the discovery signal comprises an identifier of the wireless communication device and an indication that the discovery signal is for use in mobility management.
- the transmitting module 124 may be implemented by the processor 12 and/or the transmitter 1 1 a of the wireless communications device 10.
- the wireless communications device 10 may be configured to perform all aspects of the method for use in a wireless communication device 10 described in Fig. 4.
- the disclosure also relates to a radio network node 30 configured to implement the method for use in a radio network node 30 (Fig. 5).
- the network node 30 may comprise the modules depicted in Fig. 8 for controlling access to the wireless communication network 1.
- the radio network node 30 may comprise a transmitter 31 a and a receiver 31 b for wireless signals.
- the radio network node 30 may be configured to, e.g. by means of a first receiving module 320 receive a message comprising information associated with a discovery signal transmitted by the wireless communication device 10.
- the first receiving module 320 may be implemented by a processor 32 and/or the receiver 31 b of the network node 30.
- the radio network node 30 may be configured to, e.g. by means of a determining module 321 determine resources that are used for transmission of discovery signals for use in mobility management.
- the determining module 321 may be implemented by the processor 32 of the network node 30.
- the radio network node 30 is further configured to, e.g. by means of a monitoring module 322 monitor radio resources for discovery signals.
- the monitoring module 322 may be implemented by the processor 32 and/or the receiver 31 b of the network node 30.
- the radio network node 30 is further configured to e.g. by means of an identifying module 323 identify S23, a discovery signal comprising an indication that the discovery signal is for use in mobility management.
- the identifying module 323 may be implemented by the processor 32 of the network node 30.
- the radio network node 30 may be configured to, e.g. by means of a sending module 324, send, to the serving radio network node 20 a request asking the serving radio network node 20 whether to report mobility data associated with the wireless communication device 10.
- the sending module 324 may be implemented by the processor 32 and/or the transmitter 31 a of the network node 30.
- the radio network node 30 may be configured to, e.g. by means of a second receiving module 325 receive, from the serving radio network node 30, a response acknowledging the request.
- the second receiving module 325 may be implemented by the processor 32 and/or the transmitter 31 a of the network node 30.
- the radio network node 30 may be configured to, e.g. by means of a reporting module 326 report mobility data associated with the discovery signal to one or more of the other radio network nodes.
- the reporting module 326 may be implemented by the processor 32 and/or the transmitter 31 a of the network node 30.
- the radio network nodes 30 may be configured to perform all aspects of the method for use in a radio network nodes 30 described in Fig. 5.
- the disclosure also relates to a serving radio network node 20 configured to implement the method for use in a serving radio network node 20 (Fig. 6).
- the serving radio network node 20 may comprise the modules depicted in Fig. 9 for controlling access to the wireless communication network 1.
- the serving radio network node 20 may comprise a transmitter 21 a and a receiver 21 b for wireless signals.
- the serving radio network node 20 may be configured to, e.g. by means of a determining module 220 determine a mobility status of the wireless
- the determining module 220 may be implemented by a processor 22 of the serving radio network node 20.
- the radio network node 20 may be configured to, e.g. by means of a first sending module 221 , send based on the mobility status, a message to the wireless communication device 10 comprising information associated with the transmission of the discovery signal.
- the radio network node 20 may be configured to, e.g. by means of a second sending module 222, send, based on the mobility status, to one or more of the radio network nodes 30, a message comprising information associated with measurements to be performed by the radio network node on a discovery signal.
- the first and the second sending modules 221 , 222 may be implemented by a processor 22 and/or the transmitter 21 a of the serving radio network node 20.
- the radio network node 20 may be configured to, e.g. by means of a first receiving module 223, receive a message from the radio network node 30 a request asking the serving radio network node 20 whether it wants to receive mobility data associated with the wireless communication device 10.
- the first receiving module 223 may be implemented by a processor 22 and/or the receiver 21 b of the serving radio network node 20.
- the radio network node 20 may be configured to, e.g. by means of a third sending module 224, send, to the radio network node 30, a response acknowledging the request.
- the third sending module 224 may be implemented by a processor 22 and/or the transmitter 21 a of the serving radio network node 20.
- the radio network node 20 may be configured to, e.g. by means of a second receiving module 225, receive, from one or more of the network nodes 30, 40, mobility data associated with measurements performed on a discovery signal transmitted by the wireless communication device 10.
- the second receiving module 225 may be implemented by a processor 22 and/or the receiver 21 b of the serving radio network node 20.
- the radio network node 20 may be configured to, e.g. by means of a performing module 228, perform mobility management of the wireless communication device 10 based on the received mobility data.
- the performing module 220 may be implemented by a processor 22 of the serving radio network node 20.
- the serving radio network node 20 may be configured to perform all aspects of the method for use in a serving radio network node 20 described in Fig. 6.
- Some embodiments herein may also be described as a system comprising the wireless communications device 10, the serving radio network node 20 and the radio network node 30.
- the functions or steps noted in the blocks can occur out of the order noted in the operational illustrations For example, two blocks shown in succession can in fact be executed substantially concurrently or the blocks can sometimes be executed in the reverse order, or one or more of the blocks may be skipped, depending upon the functionality/acts involved.
- the functions or steps noted in the blocks can according to some aspects of the disclosure be executed continuously in a loop.
- the embodiments herein may be implemented through one or more processors, such as the processor 12 in the wireless communications device 10 depicted in Figure 7, and the processor 22, 32 in the network nodes 20,30 depicted in Figures 8, 9 together with computer program code for performing the functions and actions of the embodiments herein.
- the program code mentioned above may also be provided as a computer program product 131 , 231 , 331 , for instance in the form of a data carrier 132, 232, 332 carrying computer program code for performing the embodiments herein when being loaded into the network node 20, 30 and the wireless communications device 10.
- One such carrier may be in the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick.
- the computer program code may furthermore be provided as pure program code on a server and downloaded via a fixed or wireless communication link to the network node 20, 30 and the wireless communications device 10.
- the methods according to the embodiments described herein for the network node 20, 30 and the wireless communications device 10 may be implemented by means of a computer program product, comprising instructions, i.e., software code portions, which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the network node 20, 30 and the wireless communications device 10.
- the computer program product may be stored on a computer-readable storage medium.
- the computer-readable storage medium, having stored there on the computer program may comprise the instructions which, when executed on at least one processor, cause the at least one processor to carry out the actions described herein, as performed by the network node 20, 30 and the wireless communications device 10.
- the computer-readable storage medium may be a non-transitory computer-readable storage medium.
- the wireless communications device 10 and the network node 20, 30 may further each comprise a memory 13, 23, 33 comprising one or more memory units.
- the memory 13, 23, 33 is arranged to be used to store obtained information, such as predetermined rules and criteria for activating the discovery signal, and to perform the methods herein when being executed in the network node 20, 30, and the wireless communications device 10.
- a computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), compact discs (CDs), digital versatile discs (DVD), etc.
- program modules may include routines, programs, objects, components, data structures, etc. that performs particular tasks or implement particular abstract data types.
- Computer-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
Abstract
Description
Claims
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US9609581B2 (en) * | 2014-01-21 | 2017-03-28 | Qualcomm Incorporated | Parameters for device to device discovery |
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